Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a2d45a2796b9d1…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 00:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f3687e81bc826107d20fc8afd19a13fb SHA-1: 8c5438f83060cd2273f65a42b6bb5210a394b4fe SHA-256: c5a2d45a2796b9d11d2b81512ba1b60e5076caba941a9aca92af2e017b1f53fd
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or a downloader. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3119

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=mulan+2020+free+online PDF link annotation
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/luzatajapolibelojosiwob.pdfIn PDF document text
    • https://ottopianos.nl/files/noxozoxodob.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/2027301457.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/jojudegamubajurubajolux.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/jusobaxigagefelugisagete.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/91066462975.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/jukaxab.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/88151952379.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/wuxadorigixevabizuseki.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/tuxadamexodar.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/mekawi.pdfIn PDF document text
    • https://le27.fr/docs/file/41374591327.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/69702429965.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/9598934749.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/9699500582.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210902013258.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/839d4a822bca25c5228ecd7bd8669ee0/magubuxonapo.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/62686871714.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/kokob.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/9834897404.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1e2c2ba287e7ab93cc9e3c8d4c839bf4/76335887162.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/18421286524.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/n0fsr55mg99i2hrabksp3kd56l/22619417405.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/66586711939.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/pomoxiwun.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 10276 bytes
SHA-256: 39bf156fd40e88dd9ce70137c4b36c6e3a4009881d71260581e473db95e20c53